Measuring the space between the rear of the motherboard tray and the rear panel shows us right at 5/8” to work with in tidying up our cables.  Not the most I’ve seen but with the space available and the number of tiedowns present anyone with patience and zip ties should be able to hide what they need to in here.

I wanted to show the side panel construction also.  I was surprised at how heavy they were when I took them off.  Looking at the edge shows they are not only rolled on the edges but also bent into a structural angle as well.  With the thickness of the steel initially and this added construction these panels are not likely to bend any time soon.

That beautiful side-panel window is held in with screws, making it easy to remove for cleaning or replacement if needed.

That’s the main unit in a nutshell.  We’ll come back and take another look in a minute.  Let’s look at the other part of this system, the 915R.

The R in 915R stands for “rear”.  There is also a matching 915F unit available.  The positions refer to PSU mounting.  The 915R is the unit that ships with the HAF Stacker 935 system.  

Looking at the 915R from the front is like looking at the main unit’s little brother:

Believe it or not, the 915R will not only house a mini-ITX motherboard.

Turning it to the sides, the differences start to show.  The left and right sides are identical, literally.  The panels are interchangeable.

At the rear is the PSU mount, I/O panel cutout and two expansion bays.

Laying the smaller unit on its side we find the mesh top that I had expected to see on top of the main unit earlier.  Fit and finish are excellent as expected and the mesh-over-honeycomb appearance carries on with the HAF legacy here as well.

The bottom of the 915R is very simple with four smaller plain passthrough holes and one larger one with rubber grommet.  Also visible in this image are the tabs used in the rail mounting system.

Looking at those identical side panels, each has its own full-length dust filter.  These are very nice filters but they are not easily removable, each held in place with four screws.  With the case as it stands now that wouldn’t be much of an issue, but given that these side panels also serve as mounting points for radiators this design could pose a problem.

With both side panels off we see how empty the 915R really is.  This unit is made to be versatile, and it fills that role very well.  In what might be considered the default configuration, the 915R will house a mini-ITX motherboard, standard ATX PSU, one 3.5-inch external drive and up to three 3.5-inch or 2.5-inch drives in a modular drive bay identical to those in the main unit.  

If the drive bays are removed the potential space is huge.    

Removing the front panel is as simple as the one on the main unit, with only four tabs instead of six.  Inside are the previously-mentioned 92mm fan and the single 3.5” external bay.  

So we have two very different enclosures with the HAF Stacker 935 system.  They are clearly meant to work together.  I’m glad to say that mounting one onto the other really is as easy as it was made out to be.  Each unit has two rails on it with notches along their length, shown previously.  

This is the side of that rail on the main unit, toward the front.  Note the screw hole.  There are four of these, two on each rail, one at each end.

To mount the 915R on top of the main unit simply set it on top, slightly rear of center, with the rails lined up and slide it forward a little bit.  When the notches line up the upper case will drop down in to the rail.  Slide it forward until it stops and secure it with screws.  Fast, easy, and evidently very strong.  I was able to pick up the entire unit by holding only the 915R, though this is obviously not recommended.

I was concerned about the visible gap between the cases, but the design team at Cooler Master though of that also, adding a small hinged metal flap that drops in place when the two units are combined to cover that gap.

Behold, the HAF Stacker 935 in its glory.

I have to say that I like it.  I can see it not being to everyone’s taste but it meets mine just fine.